<?php
namespace ZL;
class Page {

    private $total; //数据表中总记录数
    private $listRows; //每页显示行数
    private $limit;
    private $uri;
    private $pageNum; //页数
    private $config = array('header' => "个记录", "prev" => "上一页", "next" => "下一页", "first" => "首 页", "last" => "尾 页");
    private $listNum = 8;
    private $classConfig = array(
        'first' =>  'first',
        'prev'  =>    'prev',
        'pageList'  =>  'pageList',
        'active'  =>  'active',
        'next'  =>  'next',
        'last'  =>    'last',
        'goPage_text'    =>  'goPage_text',
        'goPage_button'    =>  'goPage_button',
        'has_show'    =>  true,
        'show_span'    =>  'show_span',
        'page_span'    =>  'page_span',
    );

    /*
     * $total 
     * $listRows
     */

    public function __construct($total, $listRows = 10, $classConfig=false, $pa = "") {
        $this->total = $total;
        $this->listRows = $listRows;
        $this->uri = $this->getUri($pa);
        if($classConfig)
            $this->classConfig = $classConfig;
        $this->page = !empty($_GET["p"]) ? $_GET["p"] : 1;
        if($this->page==1)
          $this->page = !empty($_POST["p"]) ? $_POST["p"] : 1;
        if(!is_numeric($this->page))
            $this->page=1;
        $this->pageNum = ceil($this->total / $this->listRows);
        $this->pageNum = $this->pageNum?$this->pageNum:1;
        $this->limit = $this->setLimit();
    }

    private function setLimit() {
        return ($this->page - 1) * $this->listRows . ", {$this->listRows}";
    }

    private function getUri($pa) {
        $url = $_SERVER["REQUEST_URI"] . (strpos($_SERVER["REQUEST_URI"], '?') ? '' : "?") . $pa;
        $parse = parse_url($url);



        if (isset($parse["query"])) {
            parse_str($parse['query'], $params);
            unset($params["page"]);
            unset($params["p"]);
            $url = $parse['path'] . '?' . http_build_query($params);
        }

        return $url;
    }

    function __get($args) {
        if ($args == "limit")
            return $this->limit;
        else
            return null;
    }

    private function start() {
        if ($this->total == 0)
            return 0;
        else
            return ($this->page - 1) * $this->listRows + 1;
    }

    private function end() {
        return min($this->page * $this->listRows, $this->total);
    }

    private function first() {
        $html = "";
        if ($this->page == 1)
            $html.='';
        else
            $html.="&nbsp;&nbsp;<a href='{$this->uri}&p=1' class='{$this->classConfig['first']}'>{$this->config["first"]}</a>&nbsp;&nbsp;";

        return $html;
    }

    private function prev() {
        $html = "";
        if ($this->page == 1)
            $html.='';
        else
            $html.="&nbsp;&nbsp;<a href='{$this->uri}&p=" . ($this->page - 1) . "' class='{$this->classConfig['prev']}'>{$this->config["prev"]}</a>&nbsp;&nbsp;";

        return $html;
    }

    private function pageList() {
        $linkPage = "";

        $inum = floor($this->listNum / 2);

        for ($i = $inum; $i >= 1; $i--) {
            $page = $this->page - $i;

            if ($page < 1)
                continue;
            $linkPage.="&nbsp;<a href='{$this->uri}&p={$page}' class='{$this->classConfig['pageList']}'>{$page}</a>&nbsp;";
        }

        $linkPage.="<span class='{$this->classConfig['active']}'> &nbsp;{$this->page}&nbsp;</span>";


        for ($i = 1; $i <= $inum; $i++) {
            $page = $this->page + $i;
            if ($page <= $this->pageNum) {
                $linkPage .= "&nbsp;<a href='{$this->uri}&p={$page}' class='{$this->classConfig['pageList']}'>{$page}</a>&nbsp;";
            }
            else
                break;
        }

        return $linkPage;
    }

    private function next() {
        $html = "";
        if ($this->page == $this->pageNum || $this->pageNum==0)
            $html.='';
        else
            $html.="&nbsp;&nbsp;<a href='{$this->uri}&p=" . ($this->page + 1) . "' class='{$this->classConfig['next']}'>{$this->config["next"]}</a>&nbsp;&nbsp;";

        return $html;
    }

    private function last() {
        $html = "";
        if ($this->page == $this->pageNum || $this->pageNum==0)
            $html.='';
        else
            $html.="&nbsp;&nbsp;<a href='{$this->uri}&p=" . ($this->pageNum) . "' class='{$this->classConfig['last']}'>{$this->config["last"]}</a>&nbsp;&nbsp;";

        return $html;
    }

    private function goPage() {
        $goPage_button = $this->classConfig['goPage_button'];
        $goPage_text = $this->classConfig['goPage_text'];
        return '&nbsp;&nbsp;<input type="text" class="'.$goPage_text.'"  onkeydown="javascript:if(event.keyCode==13){var page=(this.value>' . $this->pageNum . ')?' . $this->pageNum . ':this.value;location=\'' . $this->uri . '&p=\'+page+\'\'}" value="' . $this->page . '" style="width:25px"><input type="button" class="'.$goPage_button.'" value="GO" onclick="javascript:var page=(this.previousSibling.value>' . $this->pageNum . ')?' . $this->pageNum . ':this.previousSibling.value;location=\'' . $this->uri . '&p=\'+page+\'\'">&nbsp;&nbsp;';
    }

    function show($display = array(0, 1, 2, 3, 4, 5, 6, 7, 8)) {
        if($this->classConfig['has_show']) {
            $html[0] = "<span class='{$this->classConfig['show_span']}'> &nbsp;&nbsp;共有&nbsp;<b>{$this->total}</b>&nbsp;{$this->config["header"]}&nbsp;&nbsp;";
            $html[1] = "&nbsp;&nbsp;每页显示&nbsp;<b>" . ($this->end() - $this->start() + 1) . "</b>&nbsp;条，本页&nbsp;<b>{$this->start()}-{$this->end()}</b>&nbsp;条&nbsp;&nbsp;";
            $html[2] = "&nbsp;&nbsp;<b>{$this->page}/{$this->pageNum}</b>&nbsp;页&nbsp;&nbsp;</span>";
        }
        $html[3] = "<span class='{$this->classConfig['page_span']}'>".$this->first();
        $html[4] = $this->prev();
        $html[5] = $this->pageList();
        $html[6] = $this->next();
        $html[7] = $this->last();
        $html[8] = $this->goPage().'</span>';
        $fpage = '';
        foreach ($display as $index) {
            $fpage.=$html[$index];
        }

        return $fpage;
    }

}
